College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What happens when sweat evaporates from the skin?

It increases body temperature.
It cools the skin by taking heat with it.
It causes skin irritation.
It has no effect on body temperature.

The correct answer is: It cools the skin by taking heat with it.

When sweat evaporates from the skin, it cools the skin by taking heat with it. This process is known as evaporative cooling. As sweat forms on the skin and subsequently evaporates into the air, it absorbs heat from the body. This transfer of heat energy from the skin to the evaporating sweat lowers the skin's temperature and, consequently, helps to regulate the body’s overall temperature. During physical activity or in hot environments, the body produces more sweat as a means of thermoregulation. When sweat evaporates, it effectively cools the body down, preventing overheating. This mechanism is crucial for maintaining homeostasis and ensuring that bodily functions continue to operate efficiently, especially during exertion or heat exposure.